tā / zuì / jìn / de / xíng / zōng / shí / fēn / kě / yí / ， / sì / hū / cáng / zhe / bù / kě / gào / rén / de / mì / mì / 。

他最近的行踪十分可疑，似乎藏着不可告人的秘密。

His recent movements are very suspicious, as if he is hiding a secret that cannot be revealed.